evenrude 70 fault

[suther2727]

Hi,
i have recently purchased a evenrude 70 hp mod ae70tlcem, the motor runs fine until it warms up, at full throtle the motor will only rev just under 2000rpm ( the engine will rev up to 5000 rpm with the cold start lever ) , however it will idle fine, i have replaced the fuel/oil pump , elimenated the fueltank supply ( by swaping the fuel tank with a portable tank ) i currently have a ignition pack on order to try , have elimnated the heat sensors , there are no alarms going off with the motor warning system, does anybody have any ideas
regards tony

[boats.net]

Need to check fpr fire on each cylinder with a timing light to see if loosing fire on any cylinders, may need to remove and clean carbs.